Peristaltic Pump Breather Assembly Dynamic Sealing
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Solution Overview
Problem
The float sensor in breather assemblies for peristaltic pumps can be unreliable, leading to potential fluid leakage and operational issues when the hose fails, as it may not accurately detect fluid levels or pressure changes.
Innovation Solution
A breather assembly design featuring a cap and breather tube with a guide track and protrusion system, where the protrusion moves through different sections of the guide track under varying forces to control fluid sealing and passage, allowing for reliable detection of fluid levels and pressure changes using a float sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a float sensor is installed within the cap to detect hose failure, then the peristaltic pump can be switched off, but the float sensor can be unreliable
Solution Approach 1:
The patent replaces the unreliable float sensor with a pressure sensor that directly measures pressure changes in the breather tube. This substitution from a mechanical float-based system to a pressure-based sensing system eliminates the reliability issues associated with float sensors while providing accurate detection of hose failures and fluid levels.
Solution Approach 2:
The breather tube acts as an intermediary element that transmits pressure information from the pump chamber to the pressure sensor. This intermediary mechanism allows indirect but reliable detection of hose failure conditions through pressure changes, solving the reliability problem of direct sensing approaches.
2Object-affected harmful factors
If the cap is always sealed to prevent dust ingress, then the cavity is protected, but fluid cannot be pumped out when hose fails
Solution Approach 1:
The cap is designed with dynamic sealing capability through the protrusion-guide track mechanism that responds to pressure changes. Under normal operation, the cap remains sealed to prevent dust ingress. When hose failure occurs and pressure increases, the cap automatically opens to allow fluid discharge, thus dynamically adapting to different operational conditions to prevent both dust ingress and fluid leakage.
Solution Approach 2:
The sealing state of the cap is changed based on pressure parameters. The protrusion is held in the sealed position under normal pressure conditions, but when pressure exceeds a threshold indicating hose failure, the parameter change causes the protrusion to move and release the seal, allowing fluid to escape while maintaining protection during normal operation.
3Adaptability or versatility
If the protrusion moves freely along the guide track, then the cap can respond to pressure changes, but the sealing portion cannot maintain consistent seal
Solution Approach 1:
The guide track is segmented into distinct zones: a first section for free movement allowing pressure response, and a second section with formations that provide precise positioning for consistent sealing. This segmentation allows the protrusion to exhibit both adaptive movement for pressure response and precise positioning for manufacturing consistency in different operational phases.
Solution Approach 2:
The guide track formations are pre-configured to automatically position the protrusion at the correct sealing location when pressure conditions require sealing. This preliminary arrangement of the track geometry ensures that when the protrusion engages the seal, it does so at the precise location needed for consistent sealing, eliminating the need for additional positioning mechanisms.
Data Source
AI summary
A breather assembly for a peristaltic pump comprises a breather tube and a cap connected to the breather tube. The cap comprises a sealing portion. One of the breather tube and the cap comprises a guide track and the other of the breather tube and the cap comprises a protrusion. The guide track comprises first and second sections separated by a first formation. The second section is bounded at its distal end by a second formation. The protrusion can pass the first formation when a first force is applied to the cap. The protrusion can pass the second formation when a second force is applied to the cap. When the protrusion is located within the first section, the sealing portion of the cap seals against the breather tube. When the protrusion is located within the second section, the sealing portion of the cap is spaced from the breather tube.